Fuel-controlling device for steam-boilers.



S. ELLIOTT.

` FUEL OONTROLLING DEVICE FOR STEAM BOILERS.

ArrLIoATIon Hmm JULY 29,1909.

993,666. Patented 1111111v 3o, 1911.

STERLING ELLIOTT, 0F NEWTON, MASSACHUSETTS.

FUEL-CONTROLLING- DEVICE FOR STEAM-BOILERS.

Specification of Letters Patent.

Patented May 30, 1911.

Application led July 29, 1909. Serial No. 510,248.

To all whom t may concern:

Be it known that I, STERLING ELLIOTT, of Newton, county of Middlesex,- State of Massachusetts, have invented an Improvement in Fuel-Controlling Devices for Steam- Boilers, of which the following is a specification.

This invention relates to fuel controllingdevices for steam-boilers, and has for its object to construct an automatic controlling-device having the capability of delivering to the vaporizer or burner of the boiler a full supply of fuel, or a partial supply, (which is adapted to be regulated manually,) or of entirely shutting off the supply; said controlling-device being adapted to be operated by the steam pressure of the boiler to reduce the full supply of fuel when the pressure reaches a point considerably less than maximum, and to shut off the entire supply when the pressure reaches the maximum point.

Oftentimes it is possible to run a boiler` on much less than its full supply of fuel and still maintain a pressure sufficient to meet the demands, and the controlling-device embodyino this invention is designed `to automatically control the supply of fuel in such manner that the boiler is at all times ready to meet ordinary demands upon it, yet needless waste of fuel is prevented.

Figure 1 is a longitudinal vertical section of an automatic fuel controlling-device cmbodying this invention. Fig. 2 1s a horizontal section of the device taken on the dotted line 2 2, Fig. 1.

The case or frame A, is of suitable shape and construction to support the working parts. It is composed essentially of two parts bolted together. It has two screwthreaded nipples a, and a, adapted to be connected, respectively, by pipes leading to the source of fuel supply and to the vaporizer or burner of the boiler. It also has a continuous conduit for the fuel, extending.1 from the nipple a to the nipple a. Said conduit consists of a passage a2 in the case and extending through the nipple a, a passage as leading from said passage a2, a passage a* leading from said passage a, a pipe a5 connected with the cas-e at both ends, leading from said passage a4, a passage a inl the case leading from said pipe a, a passage a7 leading from said passage a, and a passage a8 leading from said passage a7 and extending through the nipple a. A by-pass is also provided in the case, which is connected at its ends with said fuel conduit, it being herein represented as a passage a, leading from the passage a, and a passage d10 leading from said passage a, to the passage tr. s here shown each end of the pipe a has a conical-ended plug am, secured to it, and said plugs enter recesses formedat the extremities of nipples al", al", on the case, and are held securely in place by caps a, a", engaging them and screwed onto said nipples. The assage a3 is provided with a valve-seat b, with which coperatesaneedlevalve b, arranged in the case, and adapted to o en and close said passage. The passage a10 1s provided with a valve-seat c, with which eoperates a needle-valve c, arranged in the case and adapted to be adjusted by hand toward and from its seat, and thereby vary the area of the passage. The passage a? is provided with a valve-seat (l, with which cooperates a needle valve el', arranged in the case and adapted to open and close said passage. The valve b is thus arranged between the ends of the by-pass a", al, so that when closed the fuel will pass through said by-pass, or in other words the by-pass is arranged around and connected with the conduit at opposite sides of the closingvalve.

T'he closing-valves b and cl are designed to be operated automatically by the pressure of the steam of the boiler, and the valve c is designed to be operated by hand. When all the valves are open the full supply of fuel passes through the conduit and is delivered to the vaporizer or burner; when the valve b is closed a partial supply of fuel passes through the conduit, which is regulated by the valve c', and when the valve d is closed the supply is entirely shut off. The valve o is attached to a screwthreaded stem c2, which extends through a suitable stuiing-box, and is provided with a hand-piece c3, by which it may be turned. whereby the valve c may be adjusted to occupy different positions with respect to its seat, and thereby regulate the amount of fuel' which shall go through the passage al when the valve b is closed. The needlevalves b and cl are made alike, each having a stem to which a head b2, cl2, is secured preferably made as a flat disk, and contained ina suitably shaped recess in thc case. Said needle-valves are arranged respectively in the two parts of the case, in line with each other, and extend in opposite directions, so that their heads are oppositely and adjacently disposed.

The two parts of the case have interposed between them a ring e, and the bolts e, by

which said parts are secured together and which pass through holes in said ring. The interposition of the ring between the parts of the case results in forming a chamber between said parts. r1`wo diaphragms f and g are arranged in said chamber, at opposite sides of it, and, as here shown, the edges of said diaphragms are placed between the ends of the parts of the case and the ring, and are thereby held in place. The ring e has a nipple e2 projecting from it, which is connected by a pipe with the boiler, and a passage extends through said nipple to the interior of the chamber, so that said chamber is in open communication with the boiler and is filled with water or steam from the boiler. The diaphragms f and g are thus arranged to be acted upon by the pressure of the boiler, and are adapted to be moved in opposite ways or outwardly in a direction from each other when the pressure reaches a point at which they are adjusted to be moved. The heads b2 and d2 of the needle-valves respectively bear against or may be connected with the diaphragms f and g, so that said valves are moved by said diaphragms to close the passages which they cont-rol.

Adjusting-devices are provided for the diaphragms, whereby they are adapted to be moved by dierent pressures, the diaphragm f being moved by a pressure, which is considerable less than t-he maximum pressure, and the diaphragm g being moved by the maximum pressure. Like adjusting-devices are provided for the two diaphragms. The adjusting-device for the diaphragm f, as here shown, consists of two pins h, engaging the head b2 of the needle-valve, which are connected to a disk L, contained in a recess in the case, and attached to a stemv h2, encircled by a spring 71,3, bearing on said disk 71X, and a nut h4, turning in an internally screwthreaded portion of the recess, which bears upon said spring and forces it against the disk with a yielding pressure. The pressure of the pins of the head b2 may be varied by turning said nut h4. The upper end of the recess is closed by a plug h5. The adjustingdevice will be set to exert its pressure on the head and thereby on the diaphragm, and such pressure is sufficient to hold the diaphragm against movement until the pressure on the diaphragm reaches a point considerably less than maximum when it will be moved against the action of the adjustingdevice and the valve closed on its seat. A similar adjusting-device is provided for the diaphragm g, which is adapted to exert a pressure on the head cl2 of the valve and thereby on the diaphragm g, and said adi justing-device is set so that s aid diaphragm g will not be operated until the pressure reaches the maximum, when said diaphragm will be moved against the action of the adjusting-device, and the valve d closed on its seat. It will thus be seen that when pressure rises to a point considerable less t-han maximum, the diaphragm f will be moved to close the valve b on its seat and thereby close the conduit at this point. The supply of fuel, however, may then pass through the by-pass a9, alo, and the amount may be regulated by the valve c. Thus a partial supply of fuel will be delivered. When the pressure reaches the maximum the diaphragm g will be moved to close the valve d on its seat and thereby shut off the entire supply of fuel.

In lieu of constructing the case as herein shown, and using the pipe a5 as a part of the conduit for the delivery of fuel, said case may be otherwise constructed to provide a conduit through it for the fuel, which will be controlled by the valves b and d, adapted to be operated respectively by the diaphragms and g, at different pressures, one

to reduce the fuel supply and the other to entirely shut o said supply. Furthermore, I do not desire to limit my invention to the employment of any particular form of adjusting-devices for the diaphragms.

Having thus described inyinvention, what I claim as new and desire to secure by Letters Patent, is

1. A fuel controlling-device for steamboilers consisting of a case having a delivery-conduit for the fuel and a by-pass connected with said conduit, a valve for closing the conduit between the ends of the by-pass, a regulating-valve for said by-pass, a valve for closing the conduit beyond the by-pass, a diaphragm for operating one of said closing-valves adapted to be operated by a pressure of the boiler less than maximum, and another diaphragm for operating the other closing-valve adapted to be operated by the maximum pressure of the boiler, substantially as described.

2. A fuel controlling-device for steamboilers consisting of a case having a delivery-conduit for the fuel and a b-y-pass connected with said conduit, a valve for closing the conduit between the ends of the by-pass,

a regulating-valve for said by-pass, a valve for closing the conduit beyond the by-pass, two diaphragms arranged in a chamber communicating with the boiler and connected, respectively, with said closing-valves and adjusted to operate said valves at different pressures, substantially as described.

3. A fuel controlling-device for steam-V boilers consisting of a case having a delivery-conduit for the fuel, and a by-pass connected with said conduit, a valveY for closing the conduit between the ends of the by-pass, a regulating-valve for said by-pass, a, valve for closing the conduit beyond the by-pass, two diaphragms for o erating said closingvalves, respectively, a aptcd to be operated by the pressure of the boiler, and independent adjusting-devices for said diaphragms, whereby they are adjusted to operate at different pressures, substantially as described.

4. A fuel controlling-device for steamboilers consisting of a case having a delivery-conduit for the fuel and a by-pass connected with said conduit, a valve for closing the conduit between the ends'of the by-pass, a regulating-valve for said by-pass, a valve for closing the conduit beyond the by-pass, said closing-valves each having a head, two diaphragms against which theV heads of said closing valves bear, adapted tobe operated by the pressure of the boiler, and independent adjusting-devices for engaging said heads, whereby the diap-hragms are set to operate at different pressures, substantially as described.

5. In a fuel controlling-device for steamboilers, a case having a conduit connected with a fuel-supply, and having a single pressure-chamber connected with the boiler, two valves in said case for controlling the passage of fuel through the conduit, each having a head, two diaphragms arranged in said pressure-chamber and respectively engaged by the heads of said valves, and means for adjusting said diaphragms to operate at different pressures and move the valves, substantially as described.

6. In a fuel controlling-device for steamboilers, a two-part case, a ring interposed between the parts thereof, and means for securing said parts together with the ring between them, thereby forming a chamber within the case, said chamber having means adapting it to be connected with the boiler and said case having a conduit adapted to be connected with the fuel-supply, two valves arranged in said case and controlling the passage of fuel to said conduit, and two diaphragms arranged in said chamber and adapted to operate said valves, said diaphragms being adjusted to move at different pressures to operate said valves, substantially as described.

7. In a fuel controlling-device for steamboilers, a case having a conduit connected with the fuel-supply, and valves controlling the passage of fuel therethrough, whereby the supply is partially or wholly shut -ofl",.

and two diaphragms arranged in a single pressure-chamber connected with the boiler for operating the valves, said diaphragrns being adjusted to move at different pressures, substantially as described.

8. In a fuel controlling-device for steamboilers, a case having a conduit connected with a fuel-supply, a by-pass connected with said conduit, a regulating-valve for said bypass, two valves for closing the conduit at different points with respect to the by-pass, whereby the fuel-supply is partially or wholly shut off, and two diapliragms arranged in a pressure-chamber connected with the boiler for operating said valves, respectively, said diaphragms being adjusted to move at different pressures, substantially as described.

9. A fuel-controlling-device for steamboilers consisting of a case havin a delivery-conduit for the fuel, two closing-valves for said conduit, automatic means for operating said closing-valves respectively, at different pressures to close upon their seats, a by-pass connected with said conduit around one of said closing-valves, and a regulatingvalve for said by-pass, substantially as described.

10. A fuel-controlling device for steamboilers consisting of a case having a delivery-conduit for the fuel, two independently adjustable closing-valves for said conduit, automatic meansV for operating said closingvalves respectively, at different pressures to close upon their seats, a -by-pass connected with said conduit around one of said closing-valves, and a regulating-valve for said by-pass, substantially as described.

11. A fuel-controlling device for steamboilers, consist-ing of a case havin a delivery-conduit for the fuel, two closlng-valves for said conduit, automatic means for operating said closing-valves respectively, at different pressures to close upon their Seats, and a by-pass connected with said conduit around one of said closing-valves, substantially as described.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

STERLING ELLIOTT.

lrVitnesses:

B. J. NoYns, H. B. Davis,

Copies of this patent may be obtained for ve cents each, byladdressing the Commissioner of Patents, Washington, D. C. 

